Dramatic Hair Transformations: Lena Dunham

Portman, who was donning a white Dior Couture gown and Van Cleef &Arpels jewels, debuted the new look (which was done by L.A. colorist Tracey Cunningham) at the Van Cleef &Arpels dinner for her husband's L.A. Dance Project in Los Angeles over the weekend.

Celebrity Brainiacs

"My mom says I'm like a different person," the Oscar winner told The Hollywood Reporter. "I did it just a couple of days ago."

Do you like Portman's change or prefer her as a brunette? Sound off in the comments!